Aktivni korisnici

Aktivni korisnici su one osobe koje su barem jednom u analiziranom razdoblju posudile ili vratile knjigu ili su produžile rok posudbe.

mysql> select count(distinct borrowernumber) from statistics where datetime between '2009-03-16' and '2018-09-23' ;;
mysql> select type, count(distinct borrowernumber) from statistics where datetime between '2009-03-16' and '2018-09-23' group by type ;

Ukupno od otvaranja

Kalendarske godine

Školske godine

Posudba

transakcije: posudba, vraćanje, produljenje roka, korištenje u čitaonici

• Prilikom računanja prosječnog broja transakcija posudbe po danu uzet je u obzir broj radnih dana u kojima se određena transakcija odvila barem 10 puta.

• Stvarni broj posuđivanih naslova je manji za oko 3000 (prema vrlo slobodnoj procjeni) jer zapisi nisu deduplicirani. Deduplikacija je krenula početkom 2010. godine. Podaci o broju posuđivanih primjeraka su točni.

mysql> select count(*) from statistics where borrowernumber is not null and datetime between '2009-03-16' and '2018-09-23' ;
mysql> select type, count(*) from statistics where borrowernumber is not null and datetime between '2009-03-16' and '2018-09-23' group by type ;
mysql> select count(distinct biblionumber) from statistics join items using (itemnumber) where datetime between '2009-03-16' and '2018-09-23' and type = 'issue' ;
mysql> select count(distinct itemnumber) from statistics where datetime between '2009-03-16' and '2018-09-23' and type = 'issue' ;

Ukupno od otvaranja

Kalendarske godine

Školske godine

mysql> select itemnumber, count(*) from statistics where type = 'issue' and borrowernumber is not null and date(datetime) between '2016-01-01' and '2016-12-31' group by itemnumber ;

mysql> select biblionumber, count(*) from statistics join items on items.itemnumber=statistics.itemnumber where type = 'issue' and borrowernumber is not null and date(datetime) between '2016-01-01' and '2016-12-31' group by biblionumber ;